NISPIRA Premium Platium Charcoal Water Filter Replacement for Drinkwell Pet Fountain - 6 Filters 6 premium charcoal water filters by NISPIRA replace Drinkwell water filter Fit models: Original, Big dog, Multi-tier, Platinum, Outdoor dog & Mini Suggest replacing filters every 2 weeks to keep the water clean Individual polybagged and sealed to maintain the high quality Food grade activated charcoal. Quality meet or exceed leading national brands. Solely distributed by Coffee and Toy